In terms of bonding, explain why silicate materials have relatively low densities.

Look at the picture below . what does this picture represent ?

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?